If it is your first visit to USB Phone World, please check the specifications carefully. Usually, except for 6-cell ones, other sorts of cell quantity are available here to satisfy your needs for the toshiba Satellite/Portege/Qosmio/Tecra Series battery. We recommend you to charge and discharge your Toshiba PA3356U PA3356U-1BRS at least three times at first use, while activation is necessary at least once every three months. Based on a whole year warranty, you can feel free to contact us whenever there? any problem in daily use.